Medical aircraft, that is to say, aircraft exclusively employed for the removal of wounded and sick and for the transport of medical personnel and equipment, shall not be attacked, but shall be respected by the belligerents, while flying at heights, times and on routes specifically agreed upon between the belligerents concerned. They shall bear, clearly marked, the distinctive emblem prescribed in Article 38, together with their national colours, on their lower, upper and lateral surfaces. They shall be provided with any other markings or means of identification that may be agreed upon between the belligerents upon the outbreak or during the course of hostilities. Unless agreed otherwise, flights over enemy or enemy-occupied territory are prohibited. Medical aircraft shall obey every summons to land. In the event of a landing thus imposed, the aircraft with its occupants may continue its flight after examination, if any. In the event of an involuntary landing in enemy or enemy-occupied territory, the wounded and sick, as well as the crew of the aircraft shall be prisoners of war. The medical personnel shall be treated according to Article 24, and the Articles following.